An anonymous reader writes "Technology Review reports on a startup with software used by stores to track, count and log people captured by security cameras. Prism Skylab's technology can produce heatmaps showing where people went and produce other statistics that the company claims offer tracking and analytics like those used online for the real world. One use case is for businesses to correlate online promotions and deals — such as Groupon offers — with real world footfall and in-store behavior."